Our Wild Neighbors

House Mouse

Mus musculus

Close to humans and their seeds!

Image of a House Mouse, mounted upright on its hind feet and seen in profile with its head to the right.

Description of the animal

  • Small rodent.
  • Length: body 7.5 to 10 centimetres by adulthood, tail same length.
  • Weight: between 20 and 50 grams.
  • Grey fur, lighter colour on the belly and body extremities.
  • Scaly tail.
  • Pointed nose, rounded ears, and long whiskers.

Habitat and needs

  • Is the champion among nibblers.
  • Has an omnivorous diet, with seeds a preference.
  • Is active mostly at night.
  • Reproduces at an alarming rate. A Mouse gives birth to about 40 offspring per year.
  • Rarely lives more than 12 months.


  • Mice live near humans. They can sometimes be heard at night, and signs of their passage: droppings, crumbs, holes… are greeted with despair. Mice waste more human food than they eat.
  • They can inhabit homes, living inside walls, in attics, and under floors or kitchen counters.
  • White Mice are widely used in laboratories. Some are adopted as pets.

Living with them

  • To prevent them from making nests in the house, cut off their access to food. Thus, you should:
  • Store food in metal or plastic containers with airtight lids.
  • Remove bird feeders.
  • In more serious cases, take major steps and set traps. This means trapping them one at a time or calling in an exterminator.

Participating cities where this animal has been seen